The 91st United States Congress convened from January 3, 1969, to January 3, 1971. It included the House of Representatives and the Senate, with a total of 535 members. The Congress was notable for its significant legislation, including the National Environmental Policy Act and the Gun Control Act of 1968. During this session, the Democratic Party held a majority in both chambers. Key issues addressed included civil rights, the Vietnam War, and social welfare programs. The 91st Congress played a crucial role in shaping policies that impacted American society during a time of considerable change.